<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

</head>

<body>
    <script>
        //promise终极面试题
        setTimeout(() => {
            console.log(7)
        });
        Promise.resolve()
            .then(() => {
                console.log(0)
                return Promise.resolve(4)
            })
            .then(res => {
                console.log(res)
            })
        Promise.resolve()
            .then(() => {
                console.log(1)
            })
            .then(() => {
                console.log(2)
            })
            .then(() => {
                console.log(3)
            })
            .then(() => {
                console.log(5)
            })
            .then(() => {
                console.log(6)
            }) 
    </script>
</body>

</html>